435705 divided by 21 
We want to divide 435705 by 21.

Step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 21

Let's proceed to step 2:
When dividing 43 by 21, we get 2 with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 42 from 43 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 21

Advancing to step 3:
21 can be fit into 15 0 times, resulting in a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (7) from the dividend, add it to 15, then carry on: 157 / 21

On to step 4:
21 can be fit into 157 7 times, resulting in a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 207.0
Deduct 147 from 157 and we're left with 10.
Fetch the next digit (0) from the dividend, attach it to 10 and continue: 100 / 21

Moving on to step 5:
If we divide 100 by 21, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 2074.0
Deduct 84 from 100 and we're left with 16.
Bring next digit (5) of the dividend behind the 16 and repeat the process: 165 / 21

Step 6:
165 divided by 21 is 7 with a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 20747.0
If we take 147 away from 165, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
180 divided by 21 is 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 20747.8
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
120 divided by 21 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 20747.85
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
The number 21 fits into 150 7 times, leaving a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 20747.857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 10:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 20747.8571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 11:
90 divided by 21 is 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 20747.85714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 20747.857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The next digit of our result is 8. 
Result so far: 20747.8571428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
120 divided by 21 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 20747.85714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final outcome is 20747.85714285, with a leftover of 1.5e-08.